Change-speed mechanism



I.V. GIRONS CHANGE SPEED MEGI'IANISIJ Filed Jan. 2. 1926 March 6, 192s'. 1,661,892

MIIIIIIIIIIIIWE/'lm- Inventor J? WLM/w by f Lai-W .ttorrwy Patented Mar. 6, 1928.

UNITED STATES PATENT, oFFICE. 1

IGNACIO VIVES GInoNs, F BARCELONA, SPAIN'.

CHANGE-SPEED MECHANISM.

Application led January 2, 1926, vSerial No. 78,913, and in Spain January 10, 1925.

This invention relates 'to change speed mechanism adapted for obtaining `a great number of speeds, the change being effected with great facility and without shock.

According to the invention a conical train `of gears is mounted upon the motor spindle, the elements being always in gear with other corresponding opposed elements which constitute another conical train of gears mounted upon the driven spindle, the gears beingv mounted free and independent ofV each other upon the respective spindles, the arrangementhowever being such thatat any instant any one of the gears can be keyed or secured upon the spindle on which it is mounted so that gear and spindle turn together.

The invention is illustrated by way of example in the accompanying drawing applied to speed changing gear for motor vehicles 20` to which purpose it is especially applicable.

1n thedrawings,

Figure 1 isan elevation of two trains ofV engaging gears, in which one of the trains of gears is shewn in section.

Figure 2 is a transverse sectional view of a spindle showing one ofthe gears mounted upon it, and

Figure 3 is a longitudinal sect-ion onan enlarged scale of the spindle illustrated in Figure 2, shewing the mechanism by means of which the gears are keyed `or secured upon the spindle. Y y

As illustrated in the accompanying draw'- ing, the mechanism permits of ten different forward speeds and onereverse speed, and it is constituted-of six toothed wheels 1, 1, 1, 1, 1, 1, and four 11, 11, 11 11, corresponding to the said ten speeds, and another corresponding toothed wheel `2 for the reverse the drive is imparted. This spindle is carried in bearings et and 5 and at the positions in which the said toothed wheels are sup-` ported it is constituted of parallel disposed parts indicated in the sectional view Figure 2, whereby spaces 6, 6, 6, 6, are provided between them, as well as a central conduit 7,

which permit the operation of the mechal nism for keying or securing the wheels upon the spindle. Thisvmechanism comprises a rod 8 which is adapted to slide the length of the central conduit -7 of the spindle 3, carrying at its extremity the means for keying or securing the wheelsupon the spindle. '55 The said meanscomprlse a head 9, which drive, mounted upon the spindle Bfto whichcarries four bolts-10, disposed in the manner oi a cross, corresponding respectively to the fourfspaces 6, 6, 6, 6, in the spindle, `and sub-y jectl to the action of springs 11, which tend to maintain them retracted towards the centre of the spindle, whereby the toothed wheels are not keyed `or secured upon it.

In order toefect the engagement of any desired .toothed wheel 'with the spindle, there 1s provided within the central bore of the rod 8,y another smaller rod or cable 12, terminating 1n a head13 having a conical part 14, adapted outwardly to press the bolts 10, when the head 13 is moved on tension being applied to the cable 12, and withan'other cylindrical part 15, adapted? to maintain the said bolts in the engaged position, their extremities extending into the recesses 16 (Figures land 2) of the corresponding wheel. 1

The six wheels lare separated from theI four wheels 11 by a sleeve 17 in which the head 9 passes for theneutral position, and that of the reverse drive is separated from its neighbour l11 by vmeans of a ring 171. They wheels, togeth'er with the ring and sleeve are f maintained in position at one endl by a xne1nwhereby the passage of the bolts from therecess of one wheel to that of the adjacentwheel is prevented, for inasmuch as the speeds of rotation are different, the frac,- ture "of the bolts wouldotherwise result.

Thus the movement of the lhead 9 cannot take place without first operating the cable 12. This can be effected by means connecting the cable or its equivalent with the clutch pedal of the jvehicle, 'andjpermitting the movement ofl the head 13 pressed by the spring 18. I n

The spaces 16 ina-y however-extend completely across the wheels if there be placed between the respective` wheels a metal d isc for preventing the passage lof the keying mechanism should the bolts not` be withdrawn. Y i

Each of the wheels 1 and 11 is always in gear with the corresponding wheels 28 and v.tor example, as a speed changing lever.

281, fixed upon the driven spindle 25 (Figure 1) whereby thisflatter may rotate alt the speed resulting from the .relation .existing between the wheel keyed or secured tothe motor spindle and the wheel in gear withit on the driven spindle 25, which 4corresponds to the dilerential. The wheel 2,` for the reverse drive will engage with an intermediate inion l.26, and the latter with 4the wheel` 27 hxed to the said spindle The rod 8 in sliding isoperated by means.y

of any suitable transmission which connect-s the said rod with any operating part such,

When the motor vehicle is set intomovement one ofthe Wheels 1 or l1 is keyed.y

or secured upon the spindlelby meansvof bolts l() and consequently it transmits the movement to the driven spindleby means ofY the correspondin wheel 28 or 28.* which gearsrwith the said wheel 1 or 11. When it is'` desired to change the speed the keyed wheel is disconnected -froin the spindle by the operation of the pedal and this move- `ment causing release ol the cable 12 causes the head 13 pressed by the springs 17 to slide from the right to the left and thesupport 1 5 to release the bolts, these latter passing inwardly into their recesses. Then the rod S is so disposed as to slide within the spindle 3 to the extent desired by means of a lever or other operating part provided for this purpose and when it is set into the desired position the motor spindle 3 is connected whereby the bolts 10 partially leave their recesses and key another ,of the wheels 1 or 11 upon the spindle 3 whereby the consequent scigearing` with the corresponding wheel 28 or 281 imparts a diiierent` speed' to the vehicle from that to which it previously had, or idesired the head 13 may be left in the neutral position if it is desired to stop the vehicle. ,'In this way it is possible to securea considerable number of speeds by which the speed of the vehicle is adapted to the inclination of the road.

It will be understood that it is possible to render the wheels 28 and 2S1ree upon the Ldriven spindle 25 in providing this spindle similar to the spindle 3` with spaces 6,

6, 6, 6 and with spaces 16, 1,6, 16, 16. A. series of bolts `such as 10 may thenbe disposed to act upon `the wheels 28 and 281 of the saine spindle 25 lwhereby the heads such as 9 move inthe desired manner so that they are always respectively for two wheels of each pair constantly geared together. Then it 1s not necessaryl toprovide a neutral position 17. because inasmuch as the bolts remain inactive upon the two spindles, the neutral position is produced of itself. 4 y y Y It will be understood that the forms and, arrangement of the elements, constituting the mechanism may he varied aswell `as the -'ment of the' wheels upon their spindles may beprovided ot variable number as well as the attractable bolts which may be operated by means oit springs or by other means.

It will furthermore be understood that the mechanism provided according to the invention maybe applied as indicated tomotor vehicles as well as to motor cycles and generally. to other purposes `for which change ploycd.

What I claim is: i

rl. In change speed gears of thekind in which two series of corresponding graduated gearwheels are disposed upon parallel spindles, the respective gear wheels of the series being constantly in mesh, means by which any one of the series of gear wheels is locked upon its s indle, consisting in com bination of a spind e having a coaxial-bore,

speed mechanism are usually emradial slots extending from the periphery of the spindle to1the said bore, the said gear wheels having key `slots adapted to come into positionl adjacent the said radial slotsin the said spindle, a member adapted to move within the bore of the said spindle, a head carried and rotatable on the end oi said niember,thc said head having parts adapted to slide within the said radial slots, radially disposed keying bolts carried by the said head, means adapted to move the said keying bolts radially outward on the said keying bolts being set in line with the key slots ot' one of the gear wheels, and means for retracting the said keying bolts, substantially as described.

2. In change speed gears of the kind in` which two series of corresponding graduated gear wheels are disposed upon-parallel spindles, the respective gear wheels ofthe series being constantly iny mesh, means b which any one of the series of gear wheels is locked upon its-spindle, consisting in combination ot' a spindle having aco-axial bore, radial slots extending from the periphery of the spindle to the said bore, the said gear wheels having key slots adapted to come into position adjacent the said radial slots in the said spindle, a member adapted to move within the bore of the said spindle, a head carried and rotatable on the end of said member, the said head having parts adapted to slide within the said radial slots, radially disposed keying bolts carried by the said head, helical springs adapted to maintain the said keying bolts normally in their innermost position, means adapted to move the said keying bolts radially outward on the said keying bolts being set in line with the key slots ofone ofthe said gear wheels.

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comprising a centrally disposed transmission member passing through the said member Which is adapted to move Within the bore of the said spindle, a conical head connected 5 to the end of the said transmission mem-v ber, said head having a conical face adapted to engage with the inner ends of the said ke ing bolts, and means comprising la helica spring adapted for moving Jche said transmission member to move the said conical liead outwardly from beneath the inner ends of the said keying bolts, substantially as described.

IGNACIO VIVES GIRONES. 

